By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Shares of Twitter Inc. rallied Thursday after Pacific Crest initiated coverage on the social network with an outperform rating.

Twitter (TWTR) rose 3% to close at $33.89 as Pacific Crest analyst Evan Wilson also set a price target of $45 and pointed to "revenue catalysts kicking in."

The tech sector also got a lift from Microsoft (MSFT), which was up 2.2% to close at $41.21, after FBR Capital upgraded the stock to outperform.

FBR analyst Daniel Ives told clients in a note, "We have a high degree of confidence in [Chief Executive] Satya Nadella's plan for Microsoft's future, are optimistic about its strong cloud offerings and believe Microsoft is taking necessary steps to ensure Windows successfully makes the transition to mobile."

On the downside, shares of Zynga Inc. (ZNGA) tumbled 9.2% to close at $2.97. Shares of Linkedin (LNKD) also fell nearly 1% to close at $155.24.

The Nasdaq Composite Index (RIXF) rose 1% to close at 4,296. The Morgan Stanley High Tech 35 Index (MSH) and the Philadelphia Semiconductor Index(SOX) were each up a fraction.

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